kernel/compat.c

   1 /*
   2  *  linux/kernel/compat.c
   3  *
   4  *  Kernel compatibililty routines for e.g. 32 bit syscall support
   5  *  on 64 bit kernels.
   6  *
   7  *  Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2 as
  11  *  published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/linkage.h>
  15 #include <linux/compat.h>
  16 #include <linux/errno.h>
  17 #include <linux/time.h>
  18 #include <linux/signal.h>
  19 #include <linux/sched.h>        /* for MAX_SCHEDULE_TIMEOUT */
  20 #include <linux/syscalls.h>
  21 #include <linux/unistd.h>
  22 #include <linux/security.h>
  23 #include <linux/timex.h>
  24 #include <linux/export.h>
  25 #include <linux/migrate.h>
  26 #include <linux/posix-timers.h>
  27 #include <linux/times.h>
  28 #include <linux/ptrace.h>
  29 #include <linux/gfp.h>
  30
  31 #include <asm/uaccess.h>
  32
  33 /*
  34  * Note that the native side is already converted to a timespec, because
  35  * that's what we want anyway.
  36  */
  37 static int compat_get_timeval(struct timespec *o,
  38                 struct compat_timeval __user *i)
  39 {
  40         long usec;
  41
  42         if (get_user(o->tv_sec, &i->tv_sec) ||
  43             get_user(usec, &i->tv_usec))
  44                 return -EFAULT;
  45         o->tv_nsec = usec * 1000;
  46         return 0;
  47 }
  48
  49 static int compat_put_timeval(struct compat_timeval __user *o,
  50                 struct timeval *i)
  51 {
  52         return (put_user(i->tv_sec, &o->tv_sec) ||
  53                 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
  54 }
  55
  56 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
  57 {
  58         memset(txc, 0, sizeof(struct timex));
  59
  60         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
  61                         __get_user(txc->modes, &utp->modes) ||
  62                         __get_user(txc->offset, &utp->offset) ||
  63                         __get_user(txc->freq, &utp->freq) ||
  64                         __get_user(txc->maxerror, &utp->maxerror) ||
  65                         __get_user(txc->esterror, &utp->esterror) ||
  66                         __get_user(txc->status, &utp->status) ||
  67                         __get_user(txc->constant, &utp->constant) ||
  68                         __get_user(txc->precision, &utp->precision) ||
  69                         __get_user(txc->tolerance, &utp->tolerance) ||
  70                         __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
  71                         __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
  72                         __get_user(txc->tick, &utp->tick) ||
  73                         __get_user(txc->ppsfreq, &utp->ppsfreq) ||
  74                         __get_user(txc->jitter, &utp->jitter) ||
  75                         __get_user(txc->shift, &utp->shift) ||
  76                         __get_user(txc->stabil, &utp->stabil) ||
  77                         __get_user(txc->jitcnt, &utp->jitcnt) ||
  78                         __get_user(txc->calcnt, &utp->calcnt) ||
  79                         __get_user(txc->errcnt, &utp->errcnt) ||
  80                         __get_user(txc->stbcnt, &utp->stbcnt))
  81                 return -EFAULT;
  82
  83         return 0;
  84 }
  85
  86 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
  87 {
  88         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
  89                         __put_user(txc->modes, &utp->modes) ||
  90                         __put_user(txc->offset, &utp->offset) ||
  91                         __put_user(txc->freq, &utp->freq) ||
  92                         __put_user(txc->maxerror, &utp->maxerror) ||
  93                         __put_user(txc->esterror, &utp->esterror) ||
  94                         __put_user(txc->status, &utp->status) ||
  95                         __put_user(txc->constant, &utp->constant) ||
  96                         __put_user(txc->precision, &utp->precision) ||
  97                         __put_user(txc->tolerance, &utp->tolerance) ||
  98                         __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
  99                         __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
 100                         __put_user(txc->tick, &utp->tick) ||
 101                         __put_user(txc->ppsfreq, &utp->ppsfreq) ||
 102                         __put_user(txc->jitter, &utp->jitter) ||
 103                         __put_user(txc->shift, &utp->shift) ||
 104                         __put_user(txc->stabil, &utp->stabil) ||
 105                         __put_user(txc->jitcnt, &utp->jitcnt) ||
 106                         __put_user(txc->calcnt, &utp->calcnt) ||
 107                         __put_user(txc->errcnt, &utp->errcnt) ||
 108                         __put_user(txc->stbcnt, &utp->stbcnt) ||
 109                         __put_user(txc->tai, &utp->tai))
 110                 return -EFAULT;
 111         return 0;
 112 }
 113
 114 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
 115                 struct timezone __user *tz)
 116 {
 117         if (tv) {
 118                 struct timeval ktv;
 119                 do_gettimeofday(&ktv);
 120                 if (compat_put_timeval(tv, &ktv))
 121                         return -EFAULT;
 122         }
 123         if (tz) {
 124                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 125                         return -EFAULT;
 126         }
 127
 128         return 0;
 129 }
 130
 131 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 132                 struct timezone __user *tz)
 133 {
 134         struct timespec kts;
 135         struct timezone ktz;
 136
 137         if (tv) {
 138                 if (compat_get_timeval(&kts, tv))
 139                         return -EFAULT;
 140         }
 141         if (tz) {
 142                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 143                         return -EFAULT;
 144         }
 145
 146         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 147 }
 148
 149 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
 150 {
 151         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
 152                         __get_user(ts->tv_sec, &cts->tv_sec) ||
 153                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 154 }
 155
 156 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
 157 {
 158         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
 159                         __put_user(ts->tv_sec, &cts->tv_sec) ||
 160                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 161 }
 162 EXPORT_SYMBOL_GPL(put_compat_timespec);
 163
 164 static long compat_nanosleep_restart(struct restart_block *restart)
 165 {
 166         struct compat_timespec __user *rmtp;
 167         struct timespec rmt;
 168         mm_segment_t oldfs;
 169         long ret;
 170
 171         restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
 172         oldfs = get_fs();
 173         set_fs(KERNEL_DS);
 174         ret = hrtimer_nanosleep_restart(restart);
 175         set_fs(oldfs);
 176
 177         if (ret) {
 178                 rmtp = restart->nanosleep.compat_rmtp;
 179
 180                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 181                         return -EFAULT;
 182         }
 183
 184         return ret;
 185 }
 186
 187 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 188                                      struct compat_timespec __user *rmtp)
 189 {
 190         struct timespec tu, rmt;
 191         mm_segment_t oldfs;
 192         long ret;
 193
 194         if (get_compat_timespec(&tu, rqtp))
 195                 return -EFAULT;
 196
 197         if (!timespec_valid(&tu))
 198                 return -EINVAL;
 199
 200         oldfs = get_fs();
 201         set_fs(KERNEL_DS);
 202         ret = hrtimer_nanosleep(&tu,
 203                                 rmtp ? (struct timespec __user *)&rmt : NULL,
 204                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 205         set_fs(oldfs);
 206
 207         if (ret) {
 208                 struct restart_block *restart
 209                         = &current_thread_info()->restart_block;
 210
 211                 restart->fn = compat_nanosleep_restart;
 212                 restart->nanosleep.compat_rmtp = rmtp;
 213
 214                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 215                         return -EFAULT;
 216         }
 217
 218         return ret;
 219 }
 220
 221 static inline long get_compat_itimerval(struct itimerval *o,
 222                 struct compat_itimerval __user *i)
 223 {
 224         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 225                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 226                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 227                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 228                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 229 }
 230
 231 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 232                 struct itimerval *i)
 233 {
 234         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 235                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 236                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 237                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 238                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 239 }
 240
 241 asmlinkage long compat_sys_getitimer(int which,
 242                 struct compat_itimerval __user *it)
 243 {
 244         struct itimerval kit;
 245         int error;
 246
 247         error = do_getitimer(which, &kit);
 248         if (!error && put_compat_itimerval(it, &kit))
 249                 error = -EFAULT;
 250         return error;
 251 }
 252
 253 asmlinkage long compat_sys_setitimer(int which,
 254                 struct compat_itimerval __user *in,
 255                 struct compat_itimerval __user *out)
 256 {
 257         struct itimerval kin, kout;
 258         int error;
 259
 260         if (in) {
 261                 if (get_compat_itimerval(&kin, in))
 262                         return -EFAULT;
 263         } else
 264                 memset(&kin, 0, sizeof(kin));
 265
 266         error = do_setitimer(which, &kin, out ? &kout : NULL);
 267         if (error || !out)
 268                 return error;
 269         if (put_compat_itimerval(out, &kout))
 270                 return -EFAULT;
 271         return 0;
 272 }
 273
 274 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
 275 {
 276         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
 277 }
 278
 279 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 280 {
 281         if (tbuf) {
 282                 struct tms tms;
 283                 struct compat_tms tmp;
 284
 285                 do_sys_times(&tms);
 286                 /* Convert our struct tms to the compat version. */
 287                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
 288                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
 289                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
 290                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 291                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 292                         return -EFAULT;
 293         }
 294         force_successful_syscall_return();
 295         return compat_jiffies_to_clock_t(jiffies);
 296 }
 297
 298 #ifdef __ARCH_WANT_SYS_SIGPENDING
 299
 300 /*
 301  * Assumption: old_sigset_t and compat_old_sigset_t are both
 302  * types that can be passed to put_user()/get_user().
 303  */
 304
 305 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 306 {
 307         old_sigset_t s;
 308         long ret;
 309         mm_segment_t old_fs = get_fs();
 310
 311         set_fs(KERNEL_DS);
 312         ret = sys_sigpending((old_sigset_t __user *) &s);
 313         set_fs(old_fs);
 314         if (ret == 0)
 315                 ret = put_user(s, set);
 316         return ret;
 317 }
 318
 319 #endif
 320
 321 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 322
 323 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 324                 compat_old_sigset_t __user *oset)
 325 {
 326         old_sigset_t s;
 327         long ret;
 328         mm_segment_t old_fs;
 329
 330         if (set && get_user(s, set))
 331                 return -EFAULT;
 332         old_fs = get_fs();
 333         set_fs(KERNEL_DS);
 334         ret = sys_sigprocmask(how,
 335                               set ? (old_sigset_t __user *) &s : NULL,
 336                               oset ? (old_sigset_t __user *) &s : NULL);
 337         set_fs(old_fs);
 338         if (ret == 0)
 339                 if (oset)
 340                         ret = put_user(s, oset);
 341         return ret;
 342 }
 343
 344 #endif
 345
 346 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 347                 struct compat_rlimit __user *rlim)
 348 {
 349         struct rlimit r;
 350
 351         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 352             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 353             __get_user(r.rlim_max, &rlim->rlim_max))
 354                 return -EFAULT;
 355
 356         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 357                 r.rlim_cur = RLIM_INFINITY;
 358         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 359                 r.rlim_max = RLIM_INFINITY;
 360         return do_prlimit(current, resource, &r, NULL);
 361 }
 362
 363 #ifdef COMPAT_RLIM_OLD_INFINITY
 364
 365 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 366                 struct compat_rlimit __user *rlim)
 367 {
 368         struct rlimit r;
 369         int ret;
 370         mm_segment_t old_fs = get_fs();
 371
 372         set_fs(KERNEL_DS);
 373         ret = sys_old_getrlimit(resource, &r);
 374         set_fs(old_fs);
 375
 376         if (!ret) {
 377                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 378                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 379                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 380                         r.rlim_max = COMPAT_RLIM_INFINITY;
 381
 382                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 383                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 384                     __put_user(r.rlim_max, &rlim->rlim_max))
 385                         return -EFAULT;
 386         }
 387         return ret;
 388 }
 389
 390 #endif
 391
 392 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 393                 struct compat_rlimit __user *rlim)
 394 {
 395         struct rlimit r;
 396         int ret;
 397
 398         ret = do_prlimit(current, resource, NULL, &r);
 399         if (!ret) {
 400                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 401                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 402                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 403                         r.rlim_max = COMPAT_RLIM_INFINITY;
 404
 405                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 406                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 407                     __put_user(r.rlim_max, &rlim->rlim_max))
 408                         return -EFAULT;
 409         }
 410         return ret;
 411 }
 412
 413 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 414 {
 415         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 416             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 417             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 418             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 419             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 420             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 421             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 422             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 423             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 424             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 425             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 426             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 427             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 428             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 429             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 430             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 431             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 432             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 433             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 434                 return -EFAULT;
 435         return 0;
 436 }
 437
 438 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 439 {
 440         struct rusage r;
 441         int ret;
 442         mm_segment_t old_fs = get_fs();
 443
 444         set_fs(KERNEL_DS);
 445         ret = sys_getrusage(who, (struct rusage __user *) &r);
 446         set_fs(old_fs);
 447
 448         if (ret)
 449                 return ret;
 450
 451         if (put_compat_rusage(&r, ru))
 452                 return -EFAULT;
 453
 454         return 0;
 455 }
 456
 457 asmlinkage long
 458 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 459         struct compat_rusage __user *ru)
 460 {
 461         if (!ru) {
 462                 return sys_wait4(pid, stat_addr, options, NULL);
 463         } else {
 464                 struct rusage r;
 465                 int ret;
 466                 unsigned int status;
 467                 mm_segment_t old_fs = get_fs();
 468
 469                 set_fs (KERNEL_DS);
 470                 ret = sys_wait4(pid,
 471                                 (stat_addr ?
 472                                  (unsigned int __user *) &status : NULL),
 473                                 options, (struct rusage __user *) &r);
 474                 set_fs (old_fs);
 475
 476                 if (ret > 0) {
 477                         if (put_compat_rusage(&r, ru))
 478                                 return -EFAULT;
 479                         if (stat_addr && put_user(status, stat_addr))
 480                                 return -EFAULT;
 481                 }
 482                 return ret;
 483         }
 484 }
 485
 486 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 487                 struct compat_siginfo __user *uinfo, int options,
 488                 struct compat_rusage __user *uru)
 489 {
 490         siginfo_t info;
 491         struct rusage ru;
 492         long ret;
 493         mm_segment_t old_fs = get_fs();
 494
 495         memset(&info, 0, sizeof(info));
 496
 497         set_fs(KERNEL_DS);
 498         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 499                          uru ? (struct rusage __user *)&ru : NULL);
 500         set_fs(old_fs);
 501
 502         if ((ret < 0) || (info.si_signo == 0))
 503                 return ret;
 504
 505         if (uru) {
 506                 ret = put_compat_rusage(&ru, uru);
 507                 if (ret)
 508                         return ret;
 509         }
 510
 511         BUG_ON(info.si_code & __SI_MASK);
 512         info.si_code |= __SI_CHLD;
 513         return copy_siginfo_to_user32(uinfo, &info);
 514 }
 515
 516 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 517                                     unsigned len, struct cpumask *new_mask)
 518 {
 519         unsigned long *k;
 520
 521         if (len < cpumask_size())
 522                 memset(new_mask, 0, cpumask_size());
 523         else if (len > cpumask_size())
 524                 len = cpumask_size();
 525
 526         k = cpumask_bits(new_mask);
 527         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 528 }
 529
 530 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 531                                              unsigned int len,
 532                                              compat_ulong_t __user *user_mask_ptr)
 533 {
 534         cpumask_var_t new_mask;
 535         int retval;
 536
 537         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 538                 return -ENOMEM;
 539
 540         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 541         if (retval)
 542                 goto out;
 543
 544         retval = sched_setaffinity(pid, new_mask);
 545 out:
 546         free_cpumask_var(new_mask);
 547         return retval;
 548 }
 549
 550 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 551                                              compat_ulong_t __user *user_mask_ptr)
 552 {
 553         int ret;
 554         cpumask_var_t mask;
 555
 556         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 557                 return -EINVAL;
 558         if (len & (sizeof(compat_ulong_t)-1))
 559                 return -EINVAL;
 560
 561         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 562                 return -ENOMEM;
 563
 564         ret = sched_getaffinity(pid, mask);
 565         if (ret == 0) {
 566                 size_t retlen = min_t(size_t, len, cpumask_size());
 567
 568                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 569                         ret = -EFAULT;
 570                 else
 571                         ret = retlen;
 572         }
 573         free_cpumask_var(mask);
 574
 575         return ret;
 576 }
 577
 578 int get_compat_itimerspec(struct itimerspec *dst,
 579                           const struct compat_itimerspec __user *src)
 580 {
 581         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 582             get_compat_timespec(&dst->it_value, &src->it_value))
 583                 return -EFAULT;
 584         return 0;
 585 }
 586
 587 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 588                           const struct itimerspec *src)
 589 {
 590         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 591             put_compat_timespec(&src->it_value, &dst->it_value))
 592                 return -EFAULT;
 593         return 0;
 594 }
 595
 596 long compat_sys_timer_create(clockid_t which_clock,
 597                         struct compat_sigevent __user *timer_event_spec,
 598                         timer_t __user *created_timer_id)
 599 {
 600         struct sigevent __user *event = NULL;
 601
 602         if (timer_event_spec) {
 603                 struct sigevent kevent;
 604
 605                 event = compat_alloc_user_space(sizeof(*event));
 606                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 607                     copy_to_user(event, &kevent, sizeof(*event)))
 608                         return -EFAULT;
 609         }
 610
 611         return sys_timer_create(which_clock, event, created_timer_id);
 612 }
 613
 614 long compat_sys_timer_settime(timer_t timer_id, int flags,
 615                           struct compat_itimerspec __user *new,
 616                           struct compat_itimerspec __user *old)
 617 {
 618         long err;
 619         mm_segment_t oldfs;
 620         struct itimerspec newts, oldts;
 621
 622         if (!new)
 623                 return -EINVAL;
 624         if (get_compat_itimerspec(&newts, new))
 625                 return -EFAULT;
 626         oldfs = get_fs();
 627         set_fs(KERNEL_DS);
 628         err = sys_timer_settime(timer_id, flags,
 629                                 (struct itimerspec __user *) &newts,
 630                                 (struct itimerspec __user *) &oldts);
 631         set_fs(oldfs);
 632         if (!err && old && put_compat_itimerspec(old, &oldts))
 633                 return -EFAULT;
 634         return err;
 635 }
 636
 637 long compat_sys_timer_gettime(timer_t timer_id,
 638                 struct compat_itimerspec __user *setting)
 639 {
 640         long err;
 641         mm_segment_t oldfs;
 642         struct itimerspec ts;
 643
 644         oldfs = get_fs();
 645         set_fs(KERNEL_DS);
 646         err = sys_timer_gettime(timer_id,
 647                                 (struct itimerspec __user *) &ts);
 648         set_fs(oldfs);
 649         if (!err && put_compat_itimerspec(setting, &ts))
 650                 return -EFAULT;
 651         return err;
 652 }
 653
 654 long compat_sys_clock_settime(clockid_t which_clock,
 655                 struct compat_timespec __user *tp)
 656 {
 657         long err;
 658         mm_segment_t oldfs;
 659         struct timespec ts;
 660
 661         if (get_compat_timespec(&ts, tp))
 662                 return -EFAULT;
 663         oldfs = get_fs();
 664         set_fs(KERNEL_DS);
 665         err = sys_clock_settime(which_clock,
 666                                 (struct timespec __user *) &ts);
 667         set_fs(oldfs);
 668         return err;
 669 }
 670
 671 long compat_sys_clock_gettime(clockid_t which_clock,
 672                 struct compat_timespec __user *tp)
 673 {
 674         long err;
 675         mm_segment_t oldfs;
 676         struct timespec ts;
 677
 678         oldfs = get_fs();
 679         set_fs(KERNEL_DS);
 680         err = sys_clock_gettime(which_clock,
 681                                 (struct timespec __user *) &ts);
 682         set_fs(oldfs);
 683         if (!err && put_compat_timespec(&ts, tp))
 684                 return -EFAULT;
 685         return err;
 686 }
 687
 688 long compat_sys_clock_adjtime(clockid_t which_clock,
 689                 struct compat_timex __user *utp)
 690 {
 691         struct timex txc;
 692         mm_segment_t oldfs;
 693         int err, ret;
 694
 695         err = compat_get_timex(&txc, utp);
 696         if (err)
 697                 return err;
 698
 699         oldfs = get_fs();
 700         set_fs(KERNEL_DS);
 701         ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
 702         set_fs(oldfs);
 703
 704         err = compat_put_timex(utp, &txc);
 705         if (err)
 706                 return err;
 707
 708         return ret;
 709 }
 710
 711 long compat_sys_clock_getres(clockid_t which_clock,
 712                 struct compat_timespec __user *tp)
 713 {
 714         long err;
 715         mm_segment_t oldfs;
 716         struct timespec ts;
 717
 718         oldfs = get_fs();
 719         set_fs(KERNEL_DS);
 720         err = sys_clock_getres(which_clock,
 721                                (struct timespec __user *) &ts);
 722         set_fs(oldfs);
 723         if (!err && tp && put_compat_timespec(&ts, tp))
 724                 return -EFAULT;
 725         return err;
 726 }
 727
 728 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 729 {
 730         long err;
 731         mm_segment_t oldfs;
 732         struct timespec tu;
 733         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 734
 735         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 736         oldfs = get_fs();
 737         set_fs(KERNEL_DS);
 738         err = clock_nanosleep_restart(restart);
 739         set_fs(oldfs);
 740
 741         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 742             put_compat_timespec(&tu, rmtp))
 743                 return -EFAULT;
 744
 745         if (err == -ERESTART_RESTARTBLOCK) {
 746                 restart->fn = compat_clock_nanosleep_restart;
 747                 restart->nanosleep.compat_rmtp = rmtp;
 748         }
 749         return err;
 750 }
 751
 752 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 753                             struct compat_timespec __user *rqtp,
 754                             struct compat_timespec __user *rmtp)
 755 {
 756         long err;
 757         mm_segment_t oldfs;
 758         struct timespec in, out;
 759         struct restart_block *restart;
 760
 761         if (get_compat_timespec(&in, rqtp))
 762                 return -EFAULT;
 763
 764         oldfs = get_fs();
 765         set_fs(KERNEL_DS);
 766         err = sys_clock_nanosleep(which_clock, flags,
 767                                   (struct timespec __user *) &in,
 768                                   (struct timespec __user *) &out);
 769         set_fs(oldfs);
 770
 771         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 772             put_compat_timespec(&out, rmtp))
 773                 return -EFAULT;
 774
 775         if (err == -ERESTART_RESTARTBLOCK) {
 776                 restart = &current_thread_info()->restart_block;
 777                 restart->fn = compat_clock_nanosleep_restart;
 778                 restart->nanosleep.compat_rmtp = rmtp;
 779         }
 780         return err;
 781 }
 782
 783 /*
 784  * We currently only need the following fields from the sigevent
 785  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 786  * sigev_notify_thread_id).  The others are handled in user mode.
 787  * We also assume that copying sigev_value.sival_int is sufficient
 788  * to keep all the bits of sigev_value.sival_ptr intact.
 789  */
 790 int get_compat_sigevent(struct sigevent *event,
 791                 const struct compat_sigevent __user *u_event)
 792 {
 793         memset(event, 0, sizeof(*event));
 794         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 795                 __get_user(event->sigev_value.sival_int,
 796                         &u_event->sigev_value.sival_int) ||
 797                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 798                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 799                 __get_user(event->sigev_notify_thread_id,
 800                         &u_event->sigev_notify_thread_id))
 801                 ? -EFAULT : 0;
 802 }
 803
 804 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 805                        unsigned long bitmap_size)
 806 {
 807         int i, j;
 808         unsigned long m;
 809         compat_ulong_t um;
 810         unsigned long nr_compat_longs;
 811
 812         /* align bitmap up to nearest compat_long_t boundary */
 813         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 814
 815         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 816                 return -EFAULT;
 817
 818         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 819
 820         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 821                 m = 0;
 822
 823                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 824                         /*
 825                          * We dont want to read past the end of the userspace
 826                          * bitmap. We must however ensure the end of the
 827                          * kernel bitmap is zeroed.
 828                          */
 829                         if (nr_compat_longs-- > 0) {
 830                                 if (__get_user(um, umask))
 831                                         return -EFAULT;
 832                         } else {
 833                                 um = 0;
 834                         }
 835
 836                         umask++;
 837                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 838                 }
 839                 *mask++ = m;
 840         }
 841
 842         return 0;
 843 }
 844
 845 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 846                        unsigned long bitmap_size)
 847 {
 848         int i, j;
 849         unsigned long m;
 850         compat_ulong_t um;
 851         unsigned long nr_compat_longs;
 852
 853         /* align bitmap up to nearest compat_long_t boundary */
 854         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 855
 856         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 857                 return -EFAULT;
 858
 859         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 860
 861         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 862                 m = *mask++;
 863
 864                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 865                         um = m;
 866
 867                         /*
 868                          * We dont want to write past the end of the userspace
 869                          * bitmap.
 870                          */
 871                         if (nr_compat_longs-- > 0) {
 872                                 if (__put_user(um, umask))
 873                                         return -EFAULT;
 874                         }
 875
 876                         umask++;
 877                         m >>= 4*sizeof(um);
 878                         m >>= 4*sizeof(um);
 879                 }
 880         }
 881
 882         return 0;
 883 }
 884
 885 void
 886 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 887 {
 888         switch (_NSIG_WORDS) {
 889         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 890         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 891         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 892         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 893         }
 894 }
 895 EXPORT_SYMBOL_GPL(sigset_from_compat);
 896
 897 asmlinkage long
 898 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 899                 struct compat_siginfo __user *uinfo,
 900                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 901 {
 902         compat_sigset_t s32;
 903         sigset_t s;
 904         struct timespec t;
 905         siginfo_t info;
 906         long ret;
 907
 908         if (sigsetsize != sizeof(sigset_t))
 909                 return -EINVAL;
 910
 911         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 912                 return -EFAULT;
 913         sigset_from_compat(&s, &s32);
 914
 915         if (uts) {
 916                 if (get_compat_timespec(&t, uts))
 917                         return -EFAULT;
 918         }
 919
 920         ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
 921
 922         if (ret > 0 && uinfo) {
 923                 if (copy_siginfo_to_user32(uinfo, &info))
 924                         ret = -EFAULT;
 925         }
 926
 927         return ret;
 928
 929 }
 930
 931 asmlinkage long
 932 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
 933                              struct compat_siginfo __user *uinfo)
 934 {
 935         siginfo_t info;
 936
 937         if (copy_siginfo_from_user32(&info, uinfo))
 938                 return -EFAULT;
 939         return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
 940 }
 941
 942 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 943
 944 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 945
 946 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 947 {
 948         compat_time_t i;
 949         struct timeval tv;
 950
 951         do_gettimeofday(&tv);
 952         i = tv.tv_sec;
 953
 954         if (tloc) {
 955                 if (put_user(i,tloc))
 956                         return -EFAULT;
 957         }
 958         force_successful_syscall_return();
 959         return i;
 960 }
 961
 962 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 963 {
 964         struct timespec tv;
 965         int err;
 966
 967         if (get_user(tv.tv_sec, tptr))
 968                 return -EFAULT;
 969
 970         tv.tv_nsec = 0;
 971
 972         err = security_settime(&tv, NULL);
 973         if (err)
 974                 return err;
 975
 976         do_settimeofday(&tv);
 977         return 0;
 978 }
 979
 980 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
 981
 982 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 983 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 984 {
 985         sigset_t newset;
 986         compat_sigset_t newset32;
 987
 988         /* XXX: Don't preclude handling different sized sigset_t's.  */
 989         if (sigsetsize != sizeof(sigset_t))
 990                 return -EINVAL;
 991
 992         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
 993                 return -EFAULT;
 994         sigset_from_compat(&newset, &newset32);
 995         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 996
 997         current->saved_sigmask = current->blocked;
 998         set_current_blocked(&newset);
 999
1000         current->state = TASK_INTERRUPTIBLE;
1001         schedule();
1002         set_restore_sigmask();
1003         return -ERESTARTNOHAND;
1004 }
1005 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1006
1007 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1008 {
1009         struct timex txc;
1010         int err, ret;
1011
1012         err = compat_get_timex(&txc, utp);
1013         if (err)
1014                 return err;
1015
1016         ret = do_adjtimex(&txc);
1017
1018         err = compat_put_timex(utp, &txc);
1019         if (err)
1020                 return err;
1021
1022         return ret;
1023 }
1024
1025 #ifdef CONFIG_NUMA
1026 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1027                 compat_uptr_t __user *pages32,
1028                 const int __user *nodes,
1029                 int __user *status,
1030                 int flags)
1031 {
1032         const void __user * __user *pages;
1033         int i;
1034
1035         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1036         for (i = 0; i < nr_pages; i++) {
1037                 compat_uptr_t p;
1038
1039                 if (get_user(p, pages32 + i) ||
1040                         put_user(compat_ptr(p), pages + i))
1041                         return -EFAULT;
1042         }
1043         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1044 }
1045
1046 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1047                         compat_ulong_t maxnode,
1048                         const compat_ulong_t __user *old_nodes,
1049                         const compat_ulong_t __user *new_nodes)
1050 {
1051         unsigned long __user *old = NULL;
1052         unsigned long __user *new = NULL;
1053         nodemask_t tmp_mask;
1054         unsigned long nr_bits;
1055         unsigned long size;
1056
1057         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1058         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1059         if (old_nodes) {
1060                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1061                         return -EFAULT;
1062                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1063                 if (new_nodes)
1064                         new = old + size / sizeof(unsigned long);
1065                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1066                         return -EFAULT;
1067         }
1068         if (new_nodes) {
1069                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1070                         return -EFAULT;
1071                 if (new == NULL)
1072                         new = compat_alloc_user_space(size);
1073                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1074                         return -EFAULT;
1075         }
1076         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1077 }
1078 #endif
1079
1080 struct compat_sysinfo {
1081         s32 uptime;
1082         u32 loads[3];
1083         u32 totalram;
1084         u32 freeram;
1085         u32 sharedram;
1086         u32 bufferram;
1087         u32 totalswap;
1088         u32 freeswap;
1089         u16 procs;
1090         u16 pad;
1091         u32 totalhigh;
1092         u32 freehigh;
1093         u32 mem_unit;
1094         char _f[20-2*sizeof(u32)-sizeof(int)];
1095 };
1096
1097 asmlinkage long
1098 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1099 {
1100         struct sysinfo s;
1101
1102         do_sysinfo(&s);
1103
1104         /* Check to see if any memory value is too large for 32-bit and scale
1105          *  down if needed
1106          */
1107         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1108                 int bitcount = 0;
1109
1110                 while (s.mem_unit < PAGE_SIZE) {
1111                         s.mem_unit <<= 1;
1112                         bitcount++;
1113                 }
1114
1115                 s.totalram >>= bitcount;
1116                 s.freeram >>= bitcount;
1117                 s.sharedram >>= bitcount;
1118                 s.bufferram >>= bitcount;
1119                 s.totalswap >>= bitcount;
1120                 s.freeswap >>= bitcount;
1121                 s.totalhigh >>= bitcount;
1122                 s.freehigh >>= bitcount;
1123         }
1124
1125         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1126             __put_user (s.uptime, &info->uptime) ||
1127             __put_user (s.loads[0], &info->loads[0]) ||
1128             __put_user (s.loads[1], &info->loads[1]) ||
1129             __put_user (s.loads[2], &info->loads[2]) ||
1130             __put_user (s.totalram, &info->totalram) ||
1131             __put_user (s.freeram, &info->freeram) ||
1132             __put_user (s.sharedram, &info->sharedram) ||
1133             __put_user (s.bufferram, &info->bufferram) ||
1134             __put_user (s.totalswap, &info->totalswap) ||
1135             __put_user (s.freeswap, &info->freeswap) ||
1136             __put_user (s.procs, &info->procs) ||
1137             __put_user (s.totalhigh, &info->totalhigh) ||
1138             __put_user (s.freehigh, &info->freehigh) ||
1139             __put_user (s.mem_unit, &info->mem_unit))
1140                 return -EFAULT;
1141
1142         return 0;
1143 }
1144
1145 /*
1146  * Allocate user-space memory for the duration of a single system call,
1147  * in order to marshall parameters inside a compat thunk.
1148  */
1149 void __user *compat_alloc_user_space(unsigned long len)
1150 {
1151         void __user *ptr;
1152
1153         /* If len would occupy more than half of the entire compat space... */
1154         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1155                 return NULL;
1156
1157         ptr = arch_compat_alloc_user_space(len);
1158
1159         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1160                 return NULL;
1161
1162         return ptr;
1163 }
1164 EXPORT_SYMBOL_GPL(compat_alloc_user_space);